Boiler.



W. H. WINSLOW.

BOILER.

APPLICATION FILED NOV. 2, 190B. RENBWED DEO. 11, 1911.

Patented Dec.3,1912.

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UNITED STATES PATENT onirica WILLIAM n. wINsnow, or oHIoneoQILIIINoIs, AssIoNon Tonne-STEAM Ifow'nn DEVICES COMPANY, or cHIoaoo z ILLINOIS, A conromfrion oF- ILmnors.

specificati@ of Let-ters Patent.

Patented Dee. 3, 191e.

Application mea'mwember 2, 190s, seriali-Ito. 466,550. mamen December 11,1911. serial no. 665,154.

To all whom it may concern:

Be it known that I, WILLIAM II. WINS- Low, a citizen of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented a certain new and useful Improvement in Boilers, of which the following is a full,.clear, concise, and exact descrlption, reference being had to the accompanying drawings, forming a part of' this speclfication.

My invention relates to boilers, particularly to boilers having lines. In some boilers of thisclass the flues are expanded at their 'ends in openings in the boiler heads, this clamping engagement being depended upon to prevent leaking of the boiler. However, when the boiler is unequally 'heated such that the iues become separated from the head and the boiler becomes leaky and useless. In this construction it is also necessary that the heads be comparatively thick, in order that -sutlicient contact between fiues and head be obtained during the expansion process. There is also a limitto the closeness in which the ues can be placed together, it being necessary that the amount of metal between flues bel suliicient to pre-v vent displacement of the metal from a flue which has alreadybeen expanded in place or dry heated, the uneqpal 4expansion is.

upon the expansion in place of other fluesn If there is not suiiicient metal to. prevent this disturbance when one tube is expanded in place, the metal of the head will be drawn away from tubes previously expanded in place. Diliculty is also experienced in properly joining the heads withthe shell, the heads and shell being usually separate pieces.

In accordance with my invention all the parts are securely fused together. The flues extend a distance beyond the openings in the heads, and the ends thereof are heated to a fusing heat and turned over to be fused together.

In the accompanying drawing, which illustrates my invention, Figure l is a top View of a boiler, Fig. 2 is an elevation View, partly in section along the plane 2 2, Fig. 1, Fig. 3 shows a corner of the boiler and the disposition of the tubes before the fusing operation, and Fig. 4 shows a modified arrangement. y In the form shown in Figs. l, 2, and 3,

halvesl and 2, which may be stamped integral, and which are weldedtogether at thelr edges 3. The head parts 4 and 5 of the shell have the openings 6, through which tlues 7 are passed. The .ends Y8 of these tlues primarily extend' a distance beyond the head parts, and a flame such as the autogenous flame is applied to the'ends until the ends fall outwardlyagainstthe head and become fused together. The heat can be applied for only a sufficient length of time to cause thev Hue ends to! fuse, together, or the heat may be further applied to also fuse the ends tothe heads. If. the metal of the flue ends is'not sutiicient for efficient welding, additional met-al in the form of steel wire can be inserted `in the flame -and fused with the iue metal. After -this welding operation the ends of the boiler present a smooth straight surface. The flue ends beingthus'securely fused to ether produce'a very strong and eicient oiler construction, and the thickness of the material of the parts can be considerably lessenedV without reduction in'strength,v vThe 'lues all being fused together can also be grouped together more closely, which allows much greater -iue area per cubic contents of the' boiler and the weight and sizeof the boiler can, therefore, be much reduced, while at the same time a stronger construction results, and much greater etliciency is obtained. By grouping the iues close together, better circulation therethrough is possible and the water surrounding the tubes receives a greater number of heat units per unit `of time. In practiceI have been able to double the steamin capacity in relation to the cubic contents o the boiler ascompared with prior flue spacing which is limited by the requirementsfor mechanical expansion of the tubes to make them steam tight. In general,therefore, my improvedl construction 'results in decreased weight, space, material, labor, and consequently. cost, and in increased strength and efliciency.

A strengthening jacket 9 may be applied about the-shell, this jacket being in the form of a tubev which is tirst heated 'and then shrunk over the shell. Any lsuitable inlet andoutiet meansl may be provided for the -'omitted and inl'et and outlet members 10 the boiler shell is formed of two cup shaped "and 11 threaded .intothe boiler heads. As

in boilers there is apt to be unequal heat, and I therefore unequall expansion and contraction, I 'nd it good practice to slightly bow orl deflect the heads either inwardly or outwardly before the tubes are fused, thus giving an initial direction to expanding or contracting forces, and thus preventing unequal distortion of the parts.

In Fig. 4 is shown a modified arrangement whichcould be used. The shell, instead of being formed of two integrally stamped parts, is shown as comprising a cylindrical c shell 12 and separate heads 13 and 14. The

applied-in this arrangement, and end rings 18 can also be applied about the ends, if desired.l The separate heads 13 and 14 might falso'be of some material which will with.

stand the fusing heat, but whichv can be disintegrated after the fusing operation and removed from the boiler, thus leaving theboiler formed by the iues and shell 12 fused together at the ends.

, As a protection against corrosion, the inner surface of the shell and thevouter su'rfaceof the fluescould be plated with some non-corrosive metal, such as copper. This plating, however, should not be applied to the surfaces which are to be fused together. From the above it will appear that the boiler structure described above comprises a plurality of originally separate parts which, by the fusing operation, are so joined together that the steel of which the boiler is v made is continuous throughout, and in the I employ'the term inte claims which form a part of this application al to refer to the parts thus united to deslgnate the structure thusformed, meaning thereby that the parts are so joined that the metal is continuous from one part to another and the structure produced is substantially homogeneous throughout.

Having thus described myinvention, I de.

' sire to secure the following claims-by Letters Patent 1. In a boiler, the combination of an inclosing shell having heads-provided with o enings, and lues extendingthrough the sell and through 'oppositeA openings, the ends of adjacent ues being fused together.

2. In improved boiler construction, the

combination of an inclosing shell having openings, lues extending through the shell vided with openings, and flues extending through said openings and having their 'ends fused ,over against said head.

5. In a boiler, the combination off'an inclosing shell having heads provided with openings atthe4 ends of said shell, and lues extending between the openings in said heads, t-he projecting ends of said fiues being bent over and welded to the ends of adjacent tubes and to said heads.

6. In boiler construction, the improved method of securing the ends of boiler tubes to the head, which consists in inserting said tubes in the openings in said head to allow the ends ofv said tubes to project outside of said head, and heating the projecting ends of said tubes, thereby causing said endsto becomebent over against said head, and welding the ends of adjacent'tubes together and to said head.

7. A boiler comprising wrought metal WILLIAM I-I. WINSLOW.

Witnesses:

CHARLES J .-SoHM1DT, FRANK J 'THELEN. 

